问如何使用方法来生成自定义警报对话框而不是嵌入到父视图中？

EN

import { View } from 'react-native';
import { Portal, Dialog } from 'react-native-paper';

static function showDialog(title, paragraph, buttonLabelText, onDismissHandler, canDismiss) {
    return (
        <View style={{ flex: 1 }}>
        <Portal>
            <Dialog dismissable={canDismiss} visible={need a value here} onDismiss={() => {this.onDismissHandler()}}>
                <Dialog.Title>{title}</Dialog.Title>
                <Dialog.Content>
                    <Paragraph>{paragraph}</Paragraph>
                </Dialog.Content>
                <Dialog.Actions>
                    <Button onPress={() => {this.onDismissHandler()}}>{buttonLabelText}}</Button>
                </Dialog.Actions>
            </Dialog>
        </Portal>
      </View>
    )
}


export default { showDialog };